The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2021
Filed:
Sep. 20, 2019
Smc Corporation, Chiyoda-ku, JP;
Ryuichi Masui, Bando, JP;
Naohiro Ishizawa, Tsukubamirai, JP;
SMC CORPORATION, Chiyoda-ku, JP;
Abstract
A speed reduction ratio automatic switching device includes a planetary gear mechanism. The planetary gear mechanism includes a sun gear provided for an input shaft, planetary gears in mesh with an outer circumferential side of the sun gear, an internal gear in mesh with an outer circumferential side of the planetary gears, and first and second carriers made of a semi-rigid magnetic material. The first and second carriers support the planetary gears in a rotatable manner, and rotate together with the planetary gears along with revolution of the planetary gears. Each of the sun gear, the planetary gears and the internal gear is a helical gear. First and second magnets for generating a thrust force in an axial direction are provided between the first and second carriers and the internal gear.